Combining Philosophers

Ideas for Dicaearchus, PG and Eric R. Scerri

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19 ideas

27. Natural Reality / F. Chemistry / 1. Chemistry
17415 A big chemistry idea is that covalent bonds are shared electrons, not transfer of electrons [Scerri]
17409 Does radioactivity show that only physics can explain chemistry? [Scerri]
17392 How can poisonous elements survive in the nutritious compound they compose? [Scerri]
17391 Periodicity and bonding are the two big ideas in chemistry [Scerri]
17404 Chemistry does not work from general principles, but by careful induction from large amounts of data [Scerri]
17407 The electron is the main source of chemical properties [Scerri]
27. Natural Reality / F. Chemistry / 2. Modern Elements
17418 It is now thought that all the elements have literally evolved from hydrogen [Scerri]
17398 19th C views said elements survived abstractly in compounds, but also as 'material ingredients' [Scerri]
27. Natural Reality / F. Chemistry / 3. Periodic Table
17395 Elements were ordered by equivalent weight; later by atomic weight; finally by atomic number [Scerri]
17410 Moseley showed the elements progress in units, and thereby clearly identified the gaps [Scerri]
17412 Elements are placed in the table by the number of positive charges - the atomic number [Scerri]
17422 The best classification needs the deepest and most general principles of the atoms [Scerri]
17406 Moseley, using X-rays, showed that atomic number ordered better than atomic weight [Scerri]
17408 Some suggested basing the new periodic table on isotopes, not elements [Scerri]
17413 Elements in the table are grouped by having the same number of outer-shell electrons [Scerri]
17416 Orthodoxy says the periodic table is explained by quantum mechanics [Scerri]
17417 To explain the table, quantum mechanics still needs to explain order of shell filling [Scerri]
17419 Since 99.96% of the universe is hydrogen and helium, the periodic table hardly matters [Scerri]
17414 Pauli explained the electron shells, but not the lengths of the periods in the table [Scerri]